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Dairy Cattle And Reproduction

Subjects : industries, dairy
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Animals which have only one estrous cycle (ex: dog - fox)






2. (male) pushes the testes outward toward the legs for a cool-down off of the body






3. 336 days






4. Why Dairy calves are fed powdered milk.






5. Hold the penis in the bulls body when not in use. releases penis before ejaculation or urination.






6. Microscopic - make sure not sterile - very few bulls are actually tested






7. ~60 days before calving






8. To remove/separate testicles from animal's body before animal reaches puberty






9. Male on one pin and female on other side






10. Allows extension of penis without fibro-elastic penis






11. Milk made by mother which includes antibodies for the calf. MUST be given to the calf within the first 24 hrs of life. also provides calf with energy stores. effectiveness lasts from 4-8 months of age.






12. Actual heat cycle (period)






13. 4-6 days






14. % of fat in milk. makes cheeses and ice cream. regulates cost of milk






15. 1. seminiferous tubules - 2. sertoli cells - 3. leydid or interstitial cells






16. Sperm production






17. Failure to have one testis (gonad) to descend






18. Supply nutrients for the sperm following ejaculation and deposition into the female reproductive tract






19. Animals which have only one estrous cycle (ex: dog - fox)






20. 45-60 days after breeding; re-breed as required






21. Days which have decreasing daylight hours

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22. Sperm is produced here






23. Indicator of sperm production. the bigger the scrotal circumference the bigger volume of sperm because more seminal vesicles available to produce the sperm






24. Sperm production






25. Animals which have many estrous periods during certain periods per year (ex: mare - ewe)






26. When are steers and heifers weaned from bottle feeding?






27. 14-19 (17) days






28. 114 days






29. Indicator of sperm production. the bigger the scrotal circumference the bigger volume of sperm because more seminal vesicles available to produce the sperm






30. Days which have increasing daylight hours

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31. (male) Primary sex organ - produces sperm (male gamete) and male sex hormones - 2 total






32. Hold the penis in the bulls body when not in use. releases penis before ejaculation or urination.






33. What makes the milk flow through the mammary glands?






34. When she is pregnant in her last trimester because she needs the energy to carry around and deliver the calf. and when the calf is born because the cow needs the fat to be deposit it into her milk for the calf's energy stores.






35. (male) definition: duct located outside of the testes. 3 parts: head - body - tail. 4 Functions:concentrate sperm - store sperm - transport sperm - site of sperm maturation. entire process takes ~40-60 days






36. Cycle that lasts weeks (ovulation->hormone cycles->ovulation)






37. What about the sperm for a bull which has been castrated but still has testicles?






38. Can produce 200 calves naturally (~100 bulls) - top 1-2% will grade like him. everything left to chance if no AI performed






39. S-shaped inside body - relaxes to be exposed for breeding. Disadvantges: muscles weaken with age - cannot always hold it in - exposed to harsh outside conditions or stepped on.

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40. What helps regulate spermatogenesis?






41. 1. reproduction - 2. mastitis/udder problems - 3. low milk production - 4. soundness/poor feet and legs (living on concrete)






42. Completes uterine growth initiated by estrogen and prepares the uterus for nourishment of developing embryo if pregnancy occurs - supports pregnancy by maintaining quiescent state of reproductive tract and suppresses mating behavior - prevents ovulat






43. Head - neck - mid-piece - tail. genetic material - has an enzyme covering that allows it to penetrate the egg






44. Organ of copulation - provides passageway for semen and urine - muscular organ characterized especially by its spongy - erectile tissue that fills with blood






45. Head - neck - mid-piece - tail. genetic material - has an enzyme covering that allows it to penetrate the egg






46. Not under a timeline - cow can not be sold as steak






47. 283 days






48. 1. sperm is not implanted in egg until hours after breeding. 2. fetal growth has not yet finished.






49. ~60 days before calving






50. Failure to have one testis (gonad) to descend